US Bridges

Territorial Road over Tucannon River

Fair

Columbia County, Washington · 0.231 MI Left SR12 · Structure no. 086402000000000

Built
1998
27 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
92 ft
1 main span
Daily traffic
25
2019 count
Owner
County
County Highway Agency

About this bridge

Territorial Road over Tucannon River is a prestressed concrete tee beam carrying Territorial Road over Tucannon River in Columbia County, Washington. It was built in 1998, so it is 27 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 25 vehicles a day, roughly 20% of them trucks, projected to reach 50 by 2041. The structure is 92 ft (28 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesTerritorial Road
CrossesTucannon River
Location0.231 MI Left SR12
RouteCounty Highway 27310
CountyColumbia County
StateWashington
Coordinates46.49942, -117.97867
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length92 ft (28 m)
Longest span89 ft (27.1 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2019)
Projected traffic50 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Territorial Road over Tucannon River built?

It was built in 1998, making it 27 years old in 2025.

What condition is Territorial Road over Tucannon River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does Territorial Road over Tucannon River carry?

About 25 vehicles per day (2019 count), of which roughly 20% are trucks.

How long is Territorial Road over Tucannon River?

The structure is 92 ft (28 m) long with a longest span of 89 ft (27.1 m) and a deck 31 ft wide.

Who owns Territorial Road over Tucannon River?

It is owned by the County Highway Agency.